
.container{
    width:400px;
    height:500px;
    border:1px solid #000;
    margin:0 auto;
    overflow-y: scroll;
    position: relative;
}
ul{
        list-style: none;
    margin: 0;
    padding: 0;
}
li{
    height: 50px;
    border:1px solid #000;
    box-sizing: border-box;
    text-align: center;
    line-height: 50px;
   

}
.list-phantom{
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;

}